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Impact of Changes t...
Impact of Changes to the Atmospheric Soluble Iron Deposition Flux on Ocean Biogeochemical Cycles in the Anthropocene
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- Hamilton, Douglas S. (author)
- Cornell University
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- Moore, J. Keith (author)
- University of California, Irvine
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- Arneth, Almut (author)
- Karlsruhe Institute of Technology
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- Bond, Tami C. (author)
- Colorado State University
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- Carslaw, Ken S. (author)
- University of Leeds
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- Hantson, Stijn (author)
- University of California, Irvine
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- Ito, Akinori (author)
- Japan Agency for Marine-Earth Science and Technology
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- Kaplan, Jed O. (author)
- University of Hong Kong
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- Lindsay, Keith (author)
- National Centre for Atmospheric Research
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- Nieradzik, Lars (author)
- Lund University,Lunds universitet,MERGE: ModElling the Regional and Global Earth system,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Institutionen för naturgeografi och ekosystemvetenskap,Centre for Environmental and Climate Science (CEC),Faculty of Science,Dept of Physical Geography and Ecosystem Science
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- Rathod, Sagar D. (author)
- Colorado State University
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- Scanza, Rachel A. (author)
- Pacific Northwest National Laboratory
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- Mahowald, Natalie M. (author)
- Cornell University
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(creator_code:org_t)
- 2020
- 2020
- English.
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In: Global Biogeochemical Cycles. - 0886-6236. ; 34:3
- Related links:
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http://dx.doi.org/10...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
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- Iron can be a growth‐limiting nutrient for phytoplankton, modifying rates of net primary production, nitrogen fixation, and carbon export ‐ highlighting the importance of new iron inputs from the atmosphere. The bioavailable iron fraction depends on the emission source and the dissolution during transport. The impacts of anthropogenic combustion and land use change on emissions from industrial, domestic, shipping, desert, and wildfire sources suggest that Northern Hemisphere soluble iron deposition has likely been enhanced between 2% and 68% over the Industrial Era. If policy and climate follow the intermediate Representative Concentration Pathway 4.5 trajectory, then results suggest that Southern Ocean (>30°S) soluble iron deposition would be enhanced between 63% and 95% by 2100. Marine net primary productivity and carbon export within the open ocean are most sensitive to changes in soluble iron deposition in the Southern Hemisphere; this is predominantly driven by fire rather than dust iron sources. Changes in iron deposition cause large perturbations to the marine nitrogen cycle, up to 70% increase in denitrification and 15% increase in nitrogen fixation, but only modestly impacts the carbon cycle and atmospheric CO2 concentrations (1–3 ppm). Regionally, primary productivity increases due to increased iron deposition are often compensated by offsetting decreases downstream corresponding to equivalent changes in the rate of phytoplankton macronutrient uptake, particularly in the equatorial Pacific. These effects are weaker in the Southern Ocean, suggesting that changes in iron deposition in this region dominates the global carbon cycle and climate response.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
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- By the author/editor
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Hamilton, Dougla ...
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Moore, J. Keith
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Arneth, Almut
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Bond, Tami C.
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Carslaw, Ken S.
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Hantson, Stijn
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show more...
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Ito, Akinori
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Kaplan, Jed O.
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Lindsay, Keith
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Nieradzik, Lars
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Rathod, Sagar D.
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Scanza, Rachel A ...
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Mahowald, Natali ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Physical Geograp ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Oceanography Hyd ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Meteorology and ...
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Global Biogeoche ...
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Lund University